For those interested in a more formal explanation of dogs behaviours, and as nicely summarized in this article, the apparent difference with every other mamals,

For those interested in a more formal explanation of dogs behaviours, and as nicely summarized in this article, the apparent difference with every other mamals, recent research seem to indicate that dogs have a specific genetic defect, Wlliams syndrome. The sydrome causes extreme sociability. Humans can also also have this disease and it leads to extraordinarily empathetics individuals with caracteristics facial features. https://www.insidescience.org/news/rare-human-syndrome-may-explain-why-dogs-are-so-friendly https://www.insidescience.org/news/rare-human-syndrome-may-e... https://en.m.wikipedia.org/wiki/Williams_syndrome https://en.m.wikipedia.org/wiki/Williams_syndrome